<div class="col-md-4 content-main-right">
    <div class="search">
        <h3>搜索</h3>
        <form>
            <input type="text" value="" onFocus="this.value=''" onBlur="this.value=''">
            <input type="submit" value="">
        </form>
    </div>
    <div class="categories">
        <h3>下载专区</h3>
        <li class="active"><a href="#">XXXX下载</a></li>
        <li><a href="#">XXXX下载</a></li>
        <li><a href="#">XXXX下载</a></li>
    </div>
</div>